Focusing-light-source support



Au 18, 1925. I S. P. HULL FOCUSING LIGHT SOURCE SUPPORT Filed April '7,1923 A TTORNE Y.

Patented Aug. 1925.

UNITED/STATES SAMUEL r. HULL, or NEW YORK, N. Y.

FOCUSING-LIGHT-SOURGE SUPPORT.

Application filed April 7, 1923.

To all whom it may concern:

Be it known that I, SAMUEL P. HULL, a citizen of the United States, andresident of New York city, in the county of New York and State of NewYork, have inventedher of times in exactlythe same position.

This invention includes a three or a four point support, any or all ofsaid points being adjustable to position the light source and the use ofinclined planes with these supports to take up lost motion and insure atight fit between the parts. In applying this invention use is made of aV groove engaged by an inclined member thus actugroove which preventslost motion without requiring the engaging parts to be accuratelyfitted. The supports have a screw adjustment which secures a micrometeradjustment for the bracket, and in carrying out this arrangement, theadjustment, when once set, may be permanently retained by the detachablemember which is supported by the bracket, thus enabling the adjustmentto be made in a shop or laboratory with precision and the deviceafterwards placed in service without the adjustment being changed. Otherobjects of the invention will appear from the descriptive details in thefollowing specification and illustrated in the accompanying drawings inwhich, Fig. 1 is an elevation of a lamp sup port embodying my invention,Fig. 2 is an end elevation of Fig. l, with the bulb removed, Fig. 3 is asectional detail of the i back of Fig. 2.

Fig. 4 shows another application of my invention for focussing a lamp,Fig. 5 shows another form of lamp stand embodying my invention which maybe used alternative to the construction shown in Fig. 1, Figs. 6 and7'are details of the construction used in Fig. 5.

The use of concentrated filament lamps, usually operated on low voltage,in a parafrom the bracket and replaceable any mumally securing a twopoint contact in the Serial- No. 630,665.

bolic reflector for headlights, or behind the lens of a signal lamp,requires that the source of illumination be adjusted with precision inthe exact focus of the reflector or lens and in the accompanyingdrawings my invention has been extensively illustrated for this purposealthough I regard this as only one of the uses to which it may, withadvantage, be applied. It is not commercially possible to make electricbulbs with their filaments universally positioned relative to thegeometric centre of the bulb and to the supporting socket. A screw typeof socket has no fixed position or stop relative to the filament andwith the bayonet type of socket the engaging pins may not always bear afixed relation to the filament. The present invention enables any ofthese types of lamp bulbs to be used without selection and theirfilament adjusted to the focal point desired.

The application of this invention requires the use of two separateelements, one of which is known as the fixed bracket which may beadjustably positioned and is provided with means for engaging the otherelement or supported member which in turn carries the object to besupported; the latter may be adjustable relative to the fixed bracketand the object itself may be adjustably secured to it.

The arrangement of my invention shown in' Fig. 1 may be used for asignal lamp or a locomotive headlight or other places where adjustmentof a lamp filament in the focal plane of a lens cannot be convenientlycarried out when the lamp bulb is installed or replaced. In thisapplication the lamp support is detachable with the lamp bulb and issupported by adjustable means to a fixed bracket in the lamp housing,this bracket being positioned relative to the focal centre desired. Thelamp support has adjustably secured thereto a socket base for the lampbulb and when a new bulb is applied to this support it is set up on a.testing stand before a lens or in a reflector similar to the conditionsunder which it is actually used as for instance in the signal lamp,Fig. 1. The support itself is adjusted on a fixed bracket on a testingstand and the socket base is adjusted as required to bring the filamentinto the exact focus, then the support together with the bulb are placedin service without changing the adjustment made on the testing stand.The lamp support is thus a portable unit adjusted to each individualbulb and removed and replaced with the bulb.

In the drawing 51 is a lamp housing containing the lens 52 and restingon the support 53. The fixedbracket 5411s spaced from the lamp housingand adjustably positioned by the bolts 55 and the studs 56. The methodof securing these parts will be understood from the drawings. The bolts55 in one plane hold the parts together while the studs 56 in a plane atright angles to the bolts hold the bracket 54 spaced from the lamphousing. The extent of this spacing, is, of course, regulated by thestuds which are provided with lock nuts to: hold them inthe position towhich they have been adjusted. When one stud is adjusted relative to theother the bracket 54 turns on the bolts 55 as a pivot and when one boltis adjusted. relative to the other the bracketturns about the studs as apivot. This tilts the vertical arm of the bracket 54 in two planes atright angles to each other. By this means the beam of light from thelamp 68 is adjusted as desired relative to lens 52 wit-h a micrometeradjustment. The nuts on bolts 55 are prevented from turning by theturned up strap 59 as shown. The vertical arm 54 of bracket 54 as shownin section in Fig. 3, is provided-with a slot 57 which is formed in a Vgroove and with a pair of ridges 58 equally spaced from the slot. Thedetachable bracket or support 61 is secured to the vertical arm 54 bythe bolts 62 the heads of which are countersunk so as to beself-centering in the slot 57 which they engage. The studs 63 at rightangles to the bolts 62 engage the inclined ridges 58 and space andadjust '61 relative to 54 in a manner similar to that described inconnection with the support of 54 relative to the lamp housing. Thesestuds are threaded into 61 and are provided with lock nuts so that theycan be locked in position and retain the adjustment. A socket 64 in thebracket 61 receives the insulated block 65 in which the tubular brasssocket 67 forming a support for the base of the bulb is positioned. Thispart is clamped by the screw 66 in position after the bulb 68 has beenproperly adjusted. Thus the bulbwith its supporting bracket 61 may beset up in a testing outfit, adjusted to bring the filament into exactfocus and then placed in service in the lantern 51 by slidably engagingvertical arm 54 as shown.

The construction in Fig. 4 shows the application of my invention foradjusting the light in a parabolic reflector in'which 71 is thereflector, 72 is the trout glass. 73 is the lamp bulb supported by thesocket 75 which is clamped in block 74. This block is adjusted relativeto the reflector by bolts and studs as shown in a manner similar to thatalready described.

The construction shown in Fig. 5 is another form of my invention forsupporting a lamp which includes all the features of ad justment shownin Fig. 1. In this case the base 81 is adjustably spaced and positionedby the bolts 83 and the studs 82. This base is provided with a flatcontact plate 84 to which the binding post 85 is attached and a contactplate 86 to which the binding post 87 is attached. It will be noted thatthe contact plate 86 is arched to form a spring action when depressed.The lamp bulb is attached to the socket 94 which is secured to the stem93, this stem being secured to the circular base 90. The circular baseis secured to 81 by the bolts 91 and the studs 92. The bolts passthrough the key-hole slots 88 and 89 in 81 so that by sliding to oneside the lamp support can easily be detached from the base 81. The studs92 engage the contact plates 84 and 86 making the circuit from thebinding posts 85 and 87 to the bulb so that when the bulb with itssupport is removed there are no wires to be disconnected. The stud whichengages the contact plate 86 is forced over the rise of this plate sothat the contact on both studs is maintained with. a spring action andthis spring prevents the parts from working loose. This type ofconstruction is particularly adaptable for changing over lampsoriginally designed for oil founts to the use of electric light. Thebase 81 is made substantially of the same dimensions as an oil fount.

Having thus described my invention, I claim:

1. In a light projector, the combination of a. housing, a lens, a lightsource and a compound bracket for supporting the light source in focalrelation to the lens, said compound bracket comprising two members, onemember secured to said housing and provided with inclined planes and thesecond member carrying the light source, two bolts adjustably connectingsaid bracket members and two studs at right angles to said boltsadjustably spacing said bracket members apart, said studs engaging saidinclined planes, said light source being adjustable relative to saidlens by adjusting said stubs and bolts relative to each other.

2. In a light projector, the combination ofa housing, a lens, a lightsource supported in-focal relation to said lens, a bracket forsupporting the light source, an arm with a slot therein secured to saidhousing, said bracket secured to said arm by two bolts engaging saidslot and by two. studs engaging said arm at right angles to said boltswhereby the position of said light relative to said lens is adjusted byturning said bracket about said bolts as a pivot when about said'studsas a said studs are adjusted and by turning it about said studs as apivot when said bolts are adjusted.

3. In a light projector, the combination of a housing, a lens, a lightsource supported in focal relation to said lens, a bracket forsupporting the light source, an arm with a slot therein and having aninclined plane secured to said housing, said bracket secured to said armby bolts engaging said slot and by studs at right angles to said boltsone of which engages said inclined plane/[he posit-ion of said lightrelative to said lens being adjusted by turning said bracket about saidbolts as a pivot when said studs are adjusted and by turning it pivotwhen said bolts are adjusted.

4. In a light projector, the combination of a housing, a lens, a lightsource and a compound bracket for supporting the light source in focalrelation to said lens, said compound bracket comprising a primary memberadjustably supported by said housing and a secondary member carrying thelight source adjustably supported by said primary member, a pair ofbolts in one of said members slidably engaging the other member and apair of studs at right angles to said bolts spacing'said members apart,the position of said light source relative to said lens being adjustableby said bolts and studs.

5. In a light projector, the combination of a housing, a light sourceand a compound bracket for supporting said light source, said compoundbracket comprising a primary member adjustably supported by said housingand a secondary member carrying the light source adjustably anddetachably supported by said primary member, two bolts connecting saidmembers in one plane and two studs at right angles to said bolts spacingsaid members apart, the position of said light source being adjustableby said bolts and studs.

6. In a light projector, the combination of a housing, a light sourceand a compound bracket for supporting the light source, said compoundbracket comprising a primary member supported by said housing andadjustable in two planes at right angles to each other and a secondarymember carrying,

the light source and adjustably sup orted by said primary member, a pair0 bolts slidably connecting said bracket members and a pair of studs atright angles to said bolts spacing said members apart, said secondarymember being adjustably positioned by said bolts and studs anddetachable from said primary member without changing said adj ustment;

7. In a light projector, the combination of a light source and acompound bracket for supporting the light source, said bracketcomprising a primary member having an inclined plane and a slotassociated therewith, a secondary member carrying said light source, aplurality of adjustable con-' nections between said bracket membersengaging said slot and a pair of studs at right

